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SN74AVC2T45 Datasheet(PDF) 2 Page - Texas Instruments

Part No. SN74AVC2T45
Description  DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
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Maker  TI [Texas Instruments]
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SN74AVC2T45 Datasheet(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
B1
DIR
5
7
A1
2
VCCA
VCCB
B2
6
A2
3
SN74AVC2T45
DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
SCES531I – DECEMBER 2003 – REVISED JANUARY 2007
The SN74AVC2T45 is designed for asynchronous communication between two data buses. The logic levels of
the direction-control (DIR) input activate either the B-port outputs or the A-port outputs. The device transmits
data from the A bus to the B bus when the B-port outputs are activated and from the B bus to the A bus when
the A-port outputs are activated. The input circuitry on both A and B ports always is active and must have a logic
HIGH or LOW level applied to prevent excess ICC and ICCZ.
The SN74AVC2T45 is designed so that the DIR input is powered by VCCA.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state.
NanoFree™ package technology is a major breakthrough in IC packaging concepts, using the die as the
package.
FUNCTION TABLE(1)
(EACH TRANSCEIVER)
INPUT
OPERATION
DIR
L
B data to A bus
H
A data to B bus
(1)
Input circuits of the data I/Os always are active.
LOGIC DIAGRAM (POSITIVE LOGIC)(1)
(1)
DCT and DCU packages only.
2
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